Chelsea stretched their unbeaten Premier League run to five games as Thomas Tuchel's team deservedly beat Tottenham.
After managing no shots on target in the first half, the visitors looked like a different team after the break and scored three second-half goals at the Tottenham Hotspur Stadium.
Half-time substitute N'Golo Kante added a second with his first goal in 49 league appearances, though his long-range effort took a massive deflection from Eric Dier.
Antonio Rudiger found the bottom corner in injury time to complete the win.
Blues boss Thomas Tuchel admits they needed to turn things around halftime, stating: "Yes it was, you're absolutely right. I was absolutely not happy with the first 45 minutes. There were individual performances which were great in the first half from Kepa and Thiago Silva. Even more players were good but in general we lacked intent, energy and relentless in duels and 50-50 balls.
"I had the feeling we wanted to impress by pure skills but in derbies like this it is not always about just skills. It is about aggression, winning duels and performing better as a team. We spoke clearly about it at half time. In the second half it was a very good performance and a deserved win in the second half. It was a very good reaction so I am happy with the performance in the second half."
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